add chapter04 part, to be continue, update cpp Makefile
change preface.md to Readme.md
这样点进文件夹就能看到目录
Update links in Readme.md
Chapter1 java code
add ruby version code for chapter 02
Merge branch 'master' of https://github.com/julycoding/The-Art-Of-Programming-By-July
ruby version for chapter 03
Merge pull request #128 from RONGHAI/master

ruby version for chapter 02 & 03
improve chapter 27 readability
fix chapter 27 hyperlink
Update about in Readme.md
Add reference for binary_search from Peter Norvig
java code for chapter1 & 2
Merge branch 'master' of https://github.com/schemacs/The-Art-Of-Programming-By-July
adding java code for chapter1 & 2
add some comment
Merge pull request #130 from railgunlv5/master

貌似还没有人写java？
complete build book script
add README.md in build directory
fix fenced code block not complete: last line of 01.0.md
update build/README.md